The only thing I really dislike about Franky is that his "strongest form" is when he's inside General Franky.
Wait until he turns the whole ship into a mecha. In any case, for me:
Luffy: Time skip, scar looks badass.
Zoro: I don't mind either.
Usopp: New one is much better. He has a cool weapon too.
Sanji: I don't mind either, biggest change was facial hair I'd say. It suits him.
Name: it depends. Her body looks hideous some times they do fan service shoots because it looks like she is anorexic. It's more noticeable now due to her oficial "suit" using a bikini and some jeans that have a low cut. But she has a new outfit at the beginning of each arc so I don't mind it. I like her clothes in WCI. Since she wears a corset her tiny waist doesn't look as out of place.
Chopper: he went from accidentally adorable to 5 years old. His new hat looks weird, I like the colours, but it's rounder which is weird.
Robin: her new oficial clothes are basically her going back from holidays. She changes clothes quite often, so it doesn't matter. Or hair was better, she looked unique. She still looks unique from time to time, there are a lot of details in her face than set her apart of other women. Like her eyes, nose... but most of the time Oda doesn't take the time to flesh them out. Boobs are too big and waist too small, but she doesn't wear bikinis so it's not as ugly.
Franky: I don't know what to say. Being able to change his haircut whenever he wants is cool. His powers are good. But I think he is too big, colours are a bit off and shoulders are way too big. I liked the hawaiian t-shirt and swimsuit style, he looked like a pervert. A mixed bag overall.
Brook: I dunno. I didn't like Brook until 2 chapters ago.
And Oda doesn't know how to make butts either. They're awfully tiny and plain. Man, his drawing style for women is soooo weird.